You know...good point.
Personally, I don't think that I've ever seen a 'formal' teaching video.
But, these are very easy to learn.
A couple of suggestions...go to Rocco's site and watch any of the demo videos. Here's a link to start.
http://dlite.com/magic-tricks/13-dlite-white.html
Since you know what/how the TT work, you'll be able to see some basic moves to get you started. It's all about timing, so practice in front of a mirror to help get that down.
Here's another YouTube link for a demo by Chris Ballenger.
https://www.youtube.com/watch?v=Bk1YptNCqG8
Just do what they do...and before you know it, you'll be adding to what you've learned ;-)
Best wishes....